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Stock-Based Compensation - Evergreen provision (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Jan. 01, 2020
Mar. 31, 2020
Mar. 31, 2019
Number of Options      
Available for future issuance   4,127,179  
Unrecognized share-based compensation      
Unrecognized share-based compensation - Weighted average period   2 years 9 months 18 days  
Stock options      
Number of Options      
Weighted average fair value per share of options vested   $ 2.87 $ 0.50
Forfeited, nonvested   0 0
Unrecognized share-based compensation      
Unrecognized share-based compensation cost   $ 1.9  
2019 Plan      
Number of Options      
Period of automatic increase in shares reserved   10 years  
Percentage of the common shares outstanding (as a percent)   4.00%  
Number of shares added (In shares) 623,708    
2019 Plan | Stock options      
Number of Options      
Vested   42,862 120,026
Maximum | 2019 Plan      
Number of Options      
Aggregate maximum number of shares of common stock that may be issued   6,680,000